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  <script>
    function Foo() {
      getName = function () { console.log(1) }
      return this
    }
    Foo.getName = function () { console.log(2) }
    Foo.prototype.getName = function () { console.log(3) }
    var getName = function () { console.log(4) }
    function getName () { console.log(5) }

    Foo.getName()
    getName()
    Foo().getName()
    getName()
    new Foo.getName()
    new Foo().getName()
    new new Foo().getName()
    // 2
    // 4 ※考察变量提升
    // 1 考察作用域
    // 1
    // 2 ※后面三个考察运算符顺序
    // 3 ※ p.fun = P.prototype.fun
    // 3
  </script>
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